US2093935A - Magneto generator - Google Patents

Description

Sept. 21, .1937. I w SPENGLER 2,093,935

umnmo GENERATOR I Filed May 7,, 1936 3 Sheets-Sheet l INVENTUR.

dcbter' J spalgler' wwwsa= M j se 't.21, 1937. w. J. SPE NGLER- 2,093,935

' MAGNETO GENQRATOR Fi led May 7, 1936 a Sheets-Sheet 2 INVENTOR.

Sept 21, 1937.

- w. J. SPENGLER KAGNETO GENERATOR Filed May 7, 1936 3 Sheets-Sheet 3 INVENT OR.

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Ja MW Patented Sept. 21, 1937 v 2,093,935

UNITED STATES PATENT OFFICE MAGNETO GENERATOR.

Walter J. Spengler, Sidney, N. Y., assignor to Bendix Aviation Corporation, South Bend, Ind-., a. corporation of Delaware Application May 7 1936, Serial No. 78,428

' 7 Claims. (01.171-209) The present invention relates to magneto genare suitably mounted in the frame I as by being erators and more particularly to multi-polar gencast therein and are formed at their upper ends erators for ignition of internal combustion ento receive the projecting portions of the core 4 gines. of the coil which are suitably anchored thereto 5 It is an object of thepresent invention to proas bymeans ofcap screws 1 and 8. 5 vide a novel magneto generator adapted to pro- Referring now more particularly to Figs. 3

vide i it on rrent for a m lti-cylinder-engin and- 4, it will be seen that the rotor 2 comprises which is eflicient in operation, light, simple and a shaft 9 having a smooth portion II, a squared rugged in construction and economical to manuportion [2, a reduced threaded portion IS, a re- 10 facture. Y duced-cylindrical portion H and a still further It s another bjec o Provide such a device reduced cylindrical portion l5.- A cylindrical which is adapted to provide a spark for each 45 permanent magnet l6 so magnetized as to have degrees of rotation of its rotor. its poles at the ,ends of the-cylinder is loosely It is afurther object to provide such a device mounted'onthe squared portion ll of the shaft in which the permanent magnet of the rotoriis of and is provided with polar elements I1 and i8 15 simple construction, requiring Ve y little ma-r embracing the ends of the magnet and non-rochining. 1 tatably mounted on the squared portion I! of the It is another object to provide such a device in shaft by means of corresponding squared openwhich the rotor is symmetrical in construction ings l9, 2| in the terminal disc elements 22 and and in complete dynamic balance, while the com- 23 thereof.

ponent parts of the rotor are of simple form and The polar elements l1 and I8 are formed of largely interchangeable. laminations of 'magnetic material having a It is a further object to provide such a device rounded polygonal outline forming poles or lobes in which the magnetic elements of the stator are 24 and respectively, held in assembled rela- 25 rigidly self-supporting prior to the incorporation tion by suitable means such as rivets 26. The 25 thereof in the frame Of the agneto and during openings l9 and 2| in the discs 22 and 23 are the casting of the frame. circumferentially spaced through an angle equal Another Object is to provide such a device in to one-half the side of the respective polygons which the rotor and stator are so formed that a so that the lobes 24 and 25 are equally spaced plurality of poles thereof cooperate simllltaneoiisalternately about the circumference of the rotor. 30

y so a t secure a large r na are As here shown, the polar members I] and is are for the flux paths, while permitting a plura i y formed as rounded squares which are rotated of reversals oi flux therethrough for each revolue through 45 degrees with respect to each other.

tion of the rotor. The polar members are preferably flared inter- Further objects and advantages will be apnally as shown at 21 (see also Fig. l), and a cen- 36 parent from the following description taken in tering and enclosing ring 28 of non-magnetic connection with the accompanying drawings in mate'rial is placed between the polar members which: I when in assembled position. Means for confining Fig. 1 is a side elevation, partly broken away, of the polar members on the shaft and compressa magneto embody ng a preferred embodiment ing the magnet l6 therebetween is provided in 0 of the invention; i l w the form of an abutment disc 29 adapted to F 2 is a section taken substantially onthe line bear against the shoulder 31 'of the shaft formed 2--.2 of Fig. l; at the junctions of the smooth portion 'II and Fig. 3 is a perspective and partially a phantom squared portion l2 thereof, and a second abutview showing principally the elements composing ment flange 32 threaded on the threaded porthe magnetic circuits of the magneto; and tion l3 of the shaft and, retained by suitable Fig. 4 is a perspective view of the component means such as pins 33 projecting through the elements of the rotor in disassembled relation and flange into the discs 23 as shown in Fig. 1. partly broken away. The stator pole elements 5 and 6 are formed Referring first to Fig. 1 of the drawings, there of sufilcient width, as best seen in Fig. 3, to coopis illustrated a magneto comprising a frame indierate with both the rotor polar elements I! and cated generally at l having'a rotor 2 suitably I8, and are provided with pairs of poles 34 and journalled therein and a coil 3 fixed therein with 35 respectively, having surfaces concentric with 1 its core 4 mounted transversely to the casing as the rotor and spaced so as to cooperate simultabest shown in Fig. 2. Stator pole elements 5 and neously with a pair of polar lobes 24 or 25 of u 7 between the stator pole surfaces 34 and 35 are made of su-mcientdepth to prevent any significant amount of flux from passing from arotor lobe to the stator pole element when thelobe is at an intermediate position with respect thereto. It will thus be seen by reference to Figs. 2 and 3 that when two of the lobes of one rotor pole element such as lobes 26 of element il cooperate with the polar surfaces 34 of the stator pole 5, the remaining lobes of that rotor element are spaced from the polar surfaces 35 of stator pole member 5; while a pair of lobes of rotor'element I8vcooperate with the polar surfaces 35 of stator pole 5. so that a magnetic circuit is com- I pleted from the magnet it through a pair of rotor lobes 25, stator pole member 8, the core 4 of the coil, stator pole member 5 and a pair of rotor lobes 25 back to the opposite end of the magnet. Revolution of the rotor through an angle of 45 degrees causes the cooperation of the stator pole members 5 and 6, causing flux frompoles to be reversed, whereby the direction of the flux through the external magnetic circuit is reversed.

A cover 38 is preferably provided for enclosing the magneto, this cover being retained in place by any suitable means such as indicated at 39 in Figs. 1 and 2. I

In the operation of this device, rotation of the shaft 9 from any suitable source of power derived from the engine to be ignited causes the lobes of the rotor to cooperate alternately with the the magnet It to reciprocate through the core of the coil and generate-current therein in the usual manner.. It will be noted that by reason of the form of the rotor elements as rounded squares, there will be eight reciprocations of flux through the coil for each revolution of the rotor whereby the magneto may be used to ignite an engine having 16 cylinders when the magneto is driven at crankshaft speed. It will be obvious that by suitably shaping the contour of the rotor polar elements, the magneto may be adapted for the ignition of practically any type of engine without the necessity of driving the magneto atundesirably high speeds.

Although but one form of the invention has been shown and described in detail, it will be understood that other embodiments are possible and various changes may be made in the design and arrangements of the parts without departing from the spirit of the invention as defined in the claims appended hereto.

What is claimed is:

1. In a magneto a rotor including a shaft, a cylindrical permanent magnet mounted thereon, rounded polygonal polar members non-rotatably mounted on the shaft and providing coaxial seats for the ends of the magnet, means for pressing the polar members on the magnet, and a stator having a pair of pole shoes each of which is arranged to cooperate simultaneously with a plurality of the rounded portions of said polar members.

2. In a magneto a drive shaft, a cylindrical magnet mounted coaxially thereon, a pair of rounded polygonal polar members iixed on said shaft, each cooperating with one pole of said magnet, said polar members being angularly displaced with respect to each other so as .to uniformly stagger the poles thereof, and a stator aoeaeso .Wth coaxial seats for receiving the ends of said magnet, said seats having flared portions extending over the magnet, a centering ring adapted to surround the magnet and enter the flared portions of said seats, and means on said shaft for compressing the polar elements against the magnet and centering ring. I

4. In a magneto a rotor comprising a shaft having a polygonal portion, metallic discs having corresponding polygonal openings mounted thereon, a hollow cylindrical magnet mounted on said shaft between said discs, and laminations of magnetic material fixed to said discs having circular openings adapted to receive the ends of the magnet, said laminations being of rounded polygonal shape to form a plurality of polar lobes.

5. In a magneto a rotor comprising a shaft having a polygonal portion, metallic discs having corresponding polygonal openings mounted thereon, a hollow cylindrical magnet mounted on said shaft between said discs, laminations of magnetic material fixed to said discs having circular openings adapted to receive the ends of the magnet, said laminations being of rounded polygonalto said discs at each end of the magnet, with the polar lobes of each group spaced alternately about the periphery of the rotor.

6. In a magneto a rotor comprising a shaft having a polygonal portion, metallic discs having corresponding polygonal openings mounted thereon, a'hollow cylindrical magnet mounted on said shaft between said discs, said discs being of rounded polygonal shape forming a plurality of peripheral lobes, the angular relationship between the lobes and he polygonal openings of the discs at each end of the magnet being symmetrically dissimilar so that said lobes are in staggered relation about the periphery of the rotor, and laminae of magnetic material fixed to said discs, having circular openings to receive the ends of the magnet and center the same on the shaft, and having peripheral polar lobes.

'7. In a magneto a rotorcomprising a shaft having a polygonal portion, metallic discs having corresponding polygonal openings mounted thereon, a hollow cylindrical magnet mounted on said shaft between said discs, said discs being of rounded polygonal shape forming a plurality of peripheral lobes, the angular relationship between the lobes and the polygonal openings of

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